<!DOCTYPE html>
<html>
<head>
   <link href="build/classic/theme-classic/resources/theme-classic-all.css" rel="stylesheet" />
   <script type="text/javascript" src="build/ext-all.js"></script>
   <script type="text/javascript">

       Ext.onReady(function () {
         Ext.create({
            xtype:'panel',
            renderTo: 'helloWorldPanel',
            height: 200,
            width: 200,
            
            title:'title',
            closable:true,
            items:[
            {xtype:'datefield',lable:'start'}
            ,{xtype:'panel',title:'xx',html:'b'}
            ,{xtype:'button',html:'add'}
            ]

         });
        

      });helloWorldPanel
   </script>




</head>
<body>
   <div id="helloWorldPanel"></div>
</body>
</html>